<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>


<style>
    #canvas {

        border: 1px solid red;
    }
</style>

<body>
    <input type="url" name="url" id="url" placeholder="https://example.com" pattern="https://.*" size="30" required />



    <script>



    </script>
</body>

</html>